<template>
  <view class="search-combox" :class="border ? '' : 'search-combox__no-border'">
    <view v-if="label" class="search-combox__label" :style="labelStyle">
      <text>{{label}}</text>
    </view>
    <view class="search-combox__input-box">
      <input   class="search-combox__input" type="text" :placeholder="placeholder"
                    placeholder-class="search-combox__input-plac"
                    v-model="inputVal"
                    @input="onInput"
                    @focus="onFocus"
                    @blur="onBlur" >
      </input>
      <uni-icons :type="showSelector? 'top' : 'bottom'" size="14" color="#999" @click="toggleSelector">
      </uni-icons>
    </view>
    <view class="search-combox__selector" v-if="showSelector">
      <view class="uni-popper__arrow"></view>
      <scroll-view scroll-y="true" class="search-combox__selector-scroll">
        <view class="search-combox__selector-item" v-for="(item,index) in filterCandidates" :key="index"
              @click="onSelectorClick(index)">
          <text :style="(isJSON?item[keyName]?item[keyName]==inputVal:false:item==inputVal)?'font-weight: bold;background-color: '+selectedBackground+';color: '+selectedColor:''">
            {{  item[keyName]? item[keyName].length>16? item[keyName].substring(0,16)+'...': item[keyName] :item[keyName]   }}
          </text>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
/**
 * Combox 组合输入框
 * @description 组合输入框一般用于既可以输入也可以选择的场景
 * @property {String} label 左侧文字
 * @property {String} labelWidth 左侧内容宽度
 * @property {String} placeholder 输入框占位符
 * @property {Array} candidates 候选项列表
 * @property {String} emptyTips 筛选结果为空时显示的文字
 * @property {String} value 组合框的值
 * @property {String} selectedBackground 选中项背景颜色
 * @property {String} selectedColor 选中项文字颜色
 * @property {Boolean} isJSON 是否是json数组
 * @property {String} keyName json数组显示的字段值
 */
export default {
  name: 'BiSearchComboxObj',
  emits: ['input', 'update:modelValue', 'select'],
  props: {
    isJSON: {
      type: Boolean,
      default: false
    },
    keyName: {
      type: String,
      default: ''
    },
    selectedBackground: {
      type: String,
      default: '#e5e5e5'
    },
    selectedColor: {
      type: String,
      default: '#409eff'
    },
    border: {
      type: Boolean,
      default: true
    },
    label: {
      type: String,
      default: ''
    },
    labelWidth: {
      type: String,
      default: 'auto'
    },
    placeholder: {
      type: String,
      default: ''
    },
    candidates: {
      type: Array,
      default () {
        return []
      }
    },
    emptyTips: {
      type: String,
      default: '无匹配项'
    },
    // #ifndef VUE3
    value: {
      type: [String, Number],
      default: ''
    },
    // #endif
    // #ifdef VUE3
    modelValue: {
      type: [String, Number],
      default: ''
    },
    // #endif
  },
  data() {
    return {
      isInput: false,
      showSelector: false,
      inputVal: ''
    }
  },
  computed: {
    labelStyle() {
      if (this.labelWidth === 'auto') {
        return ""
      }
      return `width: ${this.labelWidth}`
    },
    filterCandidates() {
      if (this.isInput) {
        if (this.isJSON) {
          return this.candidates.filter((item) => {
            return item[this.keyName].toString().indexOf(this.inputVal) > -1
          })
        } else {
          return this.candidates.filter((item) => {
            return item.toString().indexOf(this.inputVal) > -1
          })
        }
      } else {
        return this.candidates
      }
    },
    filterCandidatesLength() {
      return this.filterCandidates.length
    }
  },
  watch: {
    // #ifndef VUE3
    value: {
      handler(newVal) {
        this.inputVal = newVal
        this.isInput = true
      },
      immediate: true
    },
    // #endif
    // #ifdef VUE3
    modelValue: {
      handler(newVal) {
        this.inputVal = newVal
        this.isInput = true
      },
      immediate: true
    },
    // #endif
  },
  methods: {
    toggleSelector() {
      this.showSelector = !this.showSelector
      this.isInput = false
    },
    onFocus() {
      this.showSelector = true
      this.isInput = false
    },
    onBlur() {
      setTimeout(() => {
        this.showSelector = false
        this.isInput = false
      }, 153)
    },
    onSelectorClick(index) {
      console.log(index)
      let item = this.filterCandidates[index]
      if (this.isJSON) {
        this.inputVal = item[this.keyName]
      } else {
        this.inputVal = item
      }
      this.showSelector = false
      this.$emit('input', this.inputVal)
      this.$emit('update:modelValue', this.inputVal)
      this.$emit('select', item)
    },
    onInput() {
      setTimeout(() => {
        this.$emit('input', this.inputVal)
        this.$emit('update:modelValue', this.inputVal)
      })
    }
  }
}
</script>

<style lang="scss" scoped>
@media only screen and (max-width: 999px) {

  /* 针对手机： */
  .search-combox {
    font-size: 14px;
    border: 0px solid #e5e5e5;
    border-radius: 4px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    // height: 40px;
    flex-direction: row;
    align-items: center;
    // border-bottom: solid 1px #DDDDDD;
  }

}

@media only screen and (min-width: 1000px) {

  /* 针对手机： */
  .search-combox {
    background-color: #eeeeee;
    width: 100%;
    font-size: 14px;
    border: 1px solid #e5e5e5;
    border-radius: 4px;
    padding: 0px 10px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    // height: 40px;
    flex-direction: row;
    align-items: center;
    // border-bottom: solid 1px #DDDDDD;
  }

}



.search-combox__label {
  font-size: 16px;
  line-height: 22px;
  padding-right: 10px;
  color: #999999;
}

.search-combox__input-box {
  position: relative;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: row;
  align-items: center;
}

.search-combox__input {
  flex: 1;
  font-size: 14px;
  height: 80px;
  width: 100px;
  line-height: 22px;
}

.search-combox__input-plac {
  font-size: 14px;
  color: #999; //placeholder-style="color:#FFFFFF"
}

.search-combox__selector {
  /* #ifndef APP-NVUE */
  box-sizing: border-box;
  /* #endif */
  position: absolute;
  top: calc(100% + 2px);
  left: 0;
  width: 120%;
  background-color: #FFFFFF;
  border: 1px solid #EBEEF5;
  border-radius: 6px;
  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
  // z-index: 2;
  padding: 4px 0;
  height: 190px;
  z-index: 999;
}

.search-combox__selector-scroll {
  /* #ifndef APP-NVUE */
  max-height: 180px;
  box-sizing: border-box;
  /* #endif */
}

.search-combox__selector-empty,
.search-combox__selector-item {
  /* #ifndef APP-NVUE */
  display: flex;
  cursor: pointer;
  /* #endif */
  line-height: 36px;
  font-size: 14px;
  // text-align: center;
  text-indent: 1rem;
  // border-bottom: solid 1px #DDDDDD;
  padding: 0px 0px;
}

.search-combox__selector-empty text,
.search-combox__selector-item text {
  width: 100%;
}

.search-combox__selector-item:hover {
  background-color: #e5e5e5;
}

.search-combox__selector-empty:last-child,
.search-combox__selector-item:last-child {
  /* #ifndef APP-NVUE */
  border-bottom: none;
  /* #endif */
}

// picker 弹出层通用的指示小三角
.uni-popper__arrow,
.uni-popper__arrow::after {
  position: absolute;
  display: block;
  width: 0;
  height: 0;
  border-color: transparent;
  border-style: solid;
  border-width: 6px;
}

.uni-popper__arrow {
  filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
  top: -6px;
  left: 80%;
  margin-right: 3px;
  border-top-width: 0;
  border-bottom-color: #EBEEF5;
}

.uni-popper__arrow::after {
  content: " ";
  top: 1px;
  margin-left: -6px;
  border-top-width: 0;
  border-bottom-color: #fff;
}

.search-combox__no-border {
  border: none;
}
</style>
